Reptile Footprints (IMAGE) University of Nevada, Las Vegas Caption An illustration by Stephen Rowland shows how the reptile-like creature might have made the sideways tracks in the ancient sand dune. Credit Stephen Rowland Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.